【摘要】 为了提高数字水印抗非线性几何攻击的性能,设计了一种基于形殊点的鲁棒数字水印算法。该算法利用Canny算子提取图像边缘信息,将图像边缘分块并计算分块子图的形殊点坐标;利用形殊点坐标生成代表原始图像信息的特征向量;最后结合用户密钥和数字水印实现图像版权保护。仿真实验结果表明,算法在大幅度降低算法复杂性的同时,提供了一种安全的抗图像局部非线性几何攻击的方法。更多还原

【Abstract】 In order to improve the robustness of watermark algorithm resist nonlinear geometric attacks,this paper proposed an image watermark algorithm based on reference points extraction(RPE).This approach extracted the picture edge by Canny firstly.Second,blocked the picture edge and calculated the RPE coordinates of block image.Finally,obtained the copyright information by calculating user keys and the watermark.The results obtained from performance analysis show that the algorithm can reduce the computational complexity in a large scale,it’s sensitive to user keys and robust to nonlinear geometric attacks.更多还原